Immobilization effect of different materials on high As-bearing sludge
YU Bingbing1,2,3,, YAN Xianghua2,3,,, WANG Xingrun2,3, LI Lei2,3, ZHANG Yuxiu1 1.School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China 2.National Engineering Laboratory of Safety Remediation Technology for Polluted Sites, Beijing 100101, China 3.State Key Laboratory for Environmental Benchmarks and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract:The high arsenic (As)-bearing sludge produced from acid industry has too high leaching toxicity to dispose. In this study, three kinds of typical materials: inorganic sulfide, calcium-based material and several iron-aluminum-based materials (Fe0, ferric salt, Fe2O3/Al2O3), were used to immobilize the high As-bearing sludge. Their As immobilization effects were assessed by three leaching methods of TCLP(toxicity characteristic leaching procedure), H2SO4-HNO3 and H2O. The effect of immobilization on the valence and binding form distribution of arsenic in sludge was investigated. Then the optimal material for As immobilization was determined, which was used to conduct the subsequent joint solidification with cement. The screening result of materials showed that FeCl3 had the best As immobilization effect, and its As immobilization efficiencies assessed by above three leaching methods were 86.01%, 42.02%, 58.87%, respectively. The FeCl3 or Fe0 treatment could promote the As transformation to stable speciation, and the proportions of non-specific and specific bound As fractions decreased by 80.60% and 38.13%, respectively. In which FeCl3 treatment promoted the transformation from non-specific and specific bound As fractions to crystalline hydrous Fe(Mn, Al)oxide fraction and residual fraction. CaO, Fe0, FeSO4·7H2O, Fe(NO3)3·9H2O, FeCl3 and Fe2O12S3 could oxide As(Ⅲ) to As(V). Among them, the proportion of As(Ⅲ) in FeCl3 treated sludge decreased from 77.14% to 19.72%, and no obvious oxidation of As(Ⅲ) occurred in Fe(OH)3, Fe2O3 and Al2O3 treated sludge. However, due to the strong reducibility of Na2S·9H2O, the proportion of As(Ⅲ) in Na2S·9H2O treated sludge increased to 85.84%. With the increase of the dosage of FeCl3, cement or composite materials, the leaching amount of As in sludge decreased significantly. The As immobilization effect of FeCl3 alone or FeCl3+cement was better than that of cement alone. When the cement ratio was set to above 100%, FeCl3-cement As immobilization effect was better than that of FeCl3 alone. The As leaching concentrations of TCLP, H2SO4-HNO3 and H2O in 250% FeCl3+125% cement treatment were reduced to the lowest values of 113.81, 399.28 and 347.27 mg·L?1, respectively, and As immobilization efficiency reached above 97%. This study can provide reference for the immobilization of high As-bearing sludge. Key words:high As-bearing sludge/ leaching toxicity/ heavy metal immobilization/ As binding form/ As immobilization efficiency.
图1不同固定化处理对污泥中As浸出浓度的影响 Figure1.Effects of different immobilization materials on As leaching concentration in sludge
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1.School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China 2.National Engineering Laboratory of Safety Remediation Technology for Polluted Sites, Beijing 100101, China 3.State Key Laboratory for Environmental Benchmarks and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China Received Date: 2019-05-31 Accepted Date: 2019-09-05 Available Online: 2020-11-11 Keywords:high As-bearing sludge/ leaching toxicity/ heavy metal immobilization/ As binding form/ As immobilization efficiency Abstract:The high arsenic (As)-bearing sludge produced from acid industry has too high leaching toxicity to dispose. In this study, three kinds of typical materials: inorganic sulfide, calcium-based material and several iron-aluminum-based materials (Fe0, ferric salt, Fe2O3/Al2O3), were used to immobilize the high As-bearing sludge. Their As immobilization effects were assessed by three leaching methods of TCLP(toxicity characteristic leaching procedure), H2SO4-HNO3 and H2O. The effect of immobilization on the valence and binding form distribution of arsenic in sludge was investigated. Then the optimal material for As immobilization was determined, which was used to conduct the subsequent joint solidification with cement. The screening result of materials showed that FeCl3 had the best As immobilization effect, and its As immobilization efficiencies assessed by above three leaching methods were 86.01%, 42.02%, 58.87%, respectively. The FeCl3 or Fe0 treatment could promote the As transformation to stable speciation, and the proportions of non-specific and specific bound As fractions decreased by 80.60% and 38.13%, respectively. In which FeCl3 treatment promoted the transformation from non-specific and specific bound As fractions to crystalline hydrous Fe(Mn, Al)oxide fraction and residual fraction. CaO, Fe0, FeSO4·7H2O, Fe(NO3)3·9H2O, FeCl3 and Fe2O12S3 could oxide As(Ⅲ) to As(V). Among them, the proportion of As(Ⅲ) in FeCl3 treated sludge decreased from 77.14% to 19.72%, and no obvious oxidation of As(Ⅲ) occurred in Fe(OH)3, Fe2O3 and Al2O3 treated sludge. However, due to the strong reducibility of Na2S·9H2O, the proportion of As(Ⅲ) in Na2S·9H2O treated sludge increased to 85.84%. With the increase of the dosage of FeCl3, cement or composite materials, the leaching amount of As in sludge decreased significantly. The As immobilization effect of FeCl3 alone or FeCl3+cement was better than that of cement alone. When the cement ratio was set to above 100%, FeCl3-cement As immobilization effect was better than that of FeCl3 alone. The As leaching concentrations of TCLP, H2SO4-HNO3 and H2O in 250% FeCl3+125% cement treatment were reduced to the lowest values of 113.81, 399.28 and 347.27 mg·L?1, respectively, and As immobilization efficiency reached above 97%. This study can provide reference for the immobilization of high As-bearing sludge.
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